android handler用法



handler类的主要作用有两个

（1）在新启动的线程中发送消息

（2）在主线程中获取、处理消息

public class MainActivity extends Activity {

private ImageView iv;

int[] imageids = new int[] { R.drawable.fy_d_go, R.drawable.fy_d_kf,

R.drawable.fy_d_kf2, R.drawable.ic_launcher };

int currentId = 0;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

iv = (ImageView) findViewById(R.id.imageView1);

final Handler mhandle = new Handler() {

@Override

public void handleMessage(Message msg) {

if (msg.what == 0x1233) {

iv.setImageResource(imageids[currentId++ % imageids.length]);

}

}

};

new Timer().schedule(new TimerTask() {

@Override

public void run() {

mhandle.sendEmptyMessage(0x1233);

}

}, 0, 1200);

}

}